Problem with S1 node XB24-DM VER. 8067

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Hello,
I have in network two nodes: A transmitter, B receiver.
Node A sends every 1s a message with an acknowledgement
to node B.
After sending about 200 messages node A hangs, stops responding to uart and need to reset it. Node B still works.

When I changed node A to S1 PRO XBP24-DM module VER. 8062 all is ok, it worked all night.